If you have a peasant blouse pattern, this will be easy.
Otherwise, the front and back are rectangles with a slight angle cut at the top where the arm holes are.
Cut the lace the same width as the sleeves. No pattern? Cut the about 2 times as wide as a normal sleeve. Start with wide lace, since it is included in the drawstring/elastic casing.
Attach the sleeves to the front and back at the top of the bodice pieces. They will not go into the armpit. You will need to hem the rest of the arm hole on the bodice. When you sew the sides, mark the stopping point, since you won't sew clear up to the lace cap sleeves.
Fold over the elastic casing all the way around the top (sleeves, back and front).